Mozilla has already done a lot to clean up the user interface of its successful web browser, but it would seem they're not yet done. As someone who finds the current interface a little... Chaotic and distracting, I'm quite happy with the changes they're currently proposing. They basically pointed at Chrome and said "pretty much that".

I would call the UI change introduced in Firefox 4 and later an "improvement" only very hesitantly. Sure, the menu paradigm is dated and has to be replaced with something more streamlined, but they did a mediocre job in cleaning up the UI.

As in Firefox 5.0, certain useful features that have been there since forever are still only accessible via the traditional menu. For example, you have to hit Alt + V or bring back the menu bar just to enable/disable Zoom Text Only and whatnot.

All in all, the current UI feels like a mish-mash of different paradigms, neither here or there... But I'll still be using Firefox for the near future because some extensions are just indispensable for me.